Ok, so this is completely yoinked from kiwibiker.co.nz, but I thought this would be a pretty good idea for here :)
(MF if you hate it that's ok)

The rules:
640x480-ish images only (mods say so).
Post an image as a response to the last posted image.
No explanations allowed.
It's ok to be weird, but at least maintain some sort of connection.
Keep it clean or MF will cut it me thinks :)